如何在Xamarin Android中使用Threadpool下载2个文件？

Question

我使用以下代码在按钮点击下载PDF文件。我们如何在线程池中下载2个文件？

private async Task DownloadPDF(string urls, string shortName, object downloadProgressCalculator)
        {
            m_downLoadProgress = downloadProgressCalculator as DownloadProgressCalculator; 
            var pathFile = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads);
            var absolutePath = pathFile.AbsolutePath;
            var m_documentMobiNames = shortName + ".pdf";
            var mobileFileNames = Path.Combine(absolutePath, m_documentMobiNames);
            ThreadPool.QueueUserWorkItem((object state) =>
            {
                try
                {

                    if (File.Exists(mobileFileNames))
                    {
                        File.Delete(mobileFileNames);
                    }
                    if (!File.Exists(mobileFileNames))
                    {
                        m_webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);

                        m_webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(webClient_DownloadFileCompleted);
                        m_webClient.DownloadFileAsync(new Uri(urls), mobileFileNames);

                    }

                }
                catch (Exception ex)
                {

                }
            });
        }

请就此提出自己的想法。

由于